| spillway | (noun) a channel that carries excess water over or around a dam or other obstruction | Synonyms: spill, wasteweir |
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| spirilla | (noun) any flagellated aerobic bacteria having a spirally twisted rodlike form | Synonyms: spirillum |
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| spirillum | (noun) any flagellated aerobic bacteria having a spirally twisted rodlike form | Synonyms: spirilla |
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| (noun) spirally twisted elongate rodlike bacteria usually living in stagnant water | - |
| splitsville | (noun) separation or breakup or divorce | - |
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| spongillafly | (noun) hairy-bodied insect whose larvae feed on freshwater sponges | Synonyms: spongefly |
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| spoonbill | (noun) wading birds having a long flat bill with a tip like a spoon | - |
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| squill | (noun) an Old World plant of the genus Scilla having narrow basal leaves and pink or blue or white racemose flowers | Synonyms: scilla |
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| (noun) having dense spikes of small white flowers and yielding a bulb with medicinal properties | Synonyms: sea onion, sea squill, Urginea maritima |
| (noun) bulb of the sea squill, which is sliced, dried, and used as an expectorant | - |
| squilla | (noun) a kind of mantis shrimp | Synonyms: mantis prawn |
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| standstill | (noun) an interruption of normal activity | Synonyms: stand, tie-up |
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| (noun) a situation in which no progress can be made or no advancement is possible | Synonyms: dead end, deadlock, impasse, stalemate |
| still | (noun) an apparatus used for the distillation of liquids; consists of a vessel in which a substance is vaporized by heat and a condenser where the vapor is condensed | - |
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| (noun) a static photograph (especially one taken from a movie and used for advertising purposes) | - |
| (noun) a plant and works where alcoholic drinks are made by distillation | Synonyms: distillery |
| (noun) (poetic) tranquil silence | Synonyms: hush, stillness |
| stillbirth | (noun) a natural loss of the products of conception | Synonyms: miscarriage, spontaneous abortion |
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| stillness | (noun) (poetic) tranquil silence | Synonyms: hush, still |
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| (noun) calmness without winds | Synonyms: windlessness |
| (noun) a state of no motion or movement | Synonyms: lifelessness, motionlessness |
| stillroom | (noun) a pantry or storeroom connected with the kitchen (especially in a large house) for preparing tea and beverages and for storing liquors and preserves and tea etc | Synonyms: still room |
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| storksbill | (noun) any of various plants of the genus Erodium | Synonyms: heron's bill |
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| streptobacillus | (noun) any of various rod-shaped Gram-negative bacteria | - |
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| submaxilla | (noun) the jaw in vertebrates that is hinged to open the mouth | Synonyms: jawbone, jowl, lower jaw, lower jawbone, mandible, mandibula, mandibular bone |
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| supervillain | (noun) a villain with superpowers | - |
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| surveillance | (noun) close observation of a person or group (usually by the police) | - |
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| swill | (noun) wet feed (especially for pigs) consisting of mostly kitchen waste mixed with water or skimmed or sour milk | Synonyms: pigswill, pigwash, slop, slops |
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| swilling | (noun) the drinking of large mouthfuls rapidly | Synonyms: gulping, guzzling |
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| taillight | (noun) lamp (usually red) mounted at the rear of a motor vehicle | Synonyms: rear lamp, rear light, tail lamp |
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| tamarillo | (noun) South American arborescent shrub having pale pink blossoms followed by egg-shaped reddish-brown edible fruit somewhat resembling a tomato | Synonyms: tree tomato |
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| tefillin | (noun) (Judaism) either of two small leather cases containing texts from the Hebrew Scriptures (known collectively as tefillin); traditionally worn (on the forehead and the left arm) by Jewish men during morning prayer | Synonyms: phylactery |
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| tetanilla | (noun) clinical neurological syndrome characterized by muscular twitching and cramps and (when severe) seizures; associated with calcium deficiency (hypoparathyroidism) or vitamin D deficiency or alkalosis | Synonyms: apyretic tetanus, intermittent cramp, intermittent tetanus, tetany |
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| thill | (noun) one of two shafts extending from the body of a cart or carriage on either side of the animal that pulls it | - |
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| thiobacillus | (noun) small rod-shaped bacteria living in sewage or soil and oxidizing sulfur | - |
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| thornbill | (noun) any of various South American hummingbirds with a sharp pointed bill | - |
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| thrill | (noun) something that causes you to experience a sudden intense feeling or sensation | - |
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| (noun) the swift release of a store of affective force | Synonyms: bang, boot, charge, flush, kick, rush |
| (noun) an almost pleasurable sensation of fright | Synonyms: chill, frisson, quiver, shiver, shudder, tingle |
| thriller | (noun) a suspenseful adventure story or play or movie | - |
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| till | (noun) a strongbox for holding cash | Synonyms: cashbox, money box |
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| (noun) a treasury for government funds | Synonyms: public treasury, trough |
| (noun) unstratified soil deposited by a glacier; consists of sand and clay and gravel and boulders mixed together | Synonyms: boulder clay |
| tillage | (noun) the cultivation of soil for raising crops | - |
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| (noun) arable land that is worked by plowing and sowing and raising crops | Synonyms: cultivated land, farmland, ploughland, plowland, tilled land, tilth |
| tiller | (noun) lever used to turn the rudder on a boat | - |
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| (noun) a farm implement used to break up the surface of the soil (for aeration and weed control and conservation of moisture) | Synonyms: cultivator |
| (noun) someone who tills land (prepares the soil for the planting of crops) | - |
| (noun) a shoot that sprouts from the base of a grass | - |
| tilling | (noun) cultivation of the land in order to raise crops | - |
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| titillation | (noun) the act of tickling | Synonyms: tickle, tickling |
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| (noun) an agreeable arousal | - |
| (noun) a tingling feeling of excitement (as from teasing or tickling) | - |
| tomatillo | (noun) small edible yellow to purple tomato-like fruit enclosed in a bladderlike husk | Synonyms: husk tomato, Mexican husk tomato |
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| (noun) annual of Mexico and southern United States having edible purplish viscid fruit resembling small tomatoes | Synonyms: jamberry, Mexican husk tomato, Physalis ixocarpa |
| (noun) Mexican annual naturalized in eastern North America having yellow to purple edible fruit resembling small tomatoes | Synonyms: jamberry, miltomate, Physalis philadelphica, purple ground cherry |
| tonsilla | (noun) either of two masses of lymphatic tissue one on each side of the oral pharynx | Synonyms: faucial tonsil, palatine tonsil, tonsil |
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| tonsillectomy | (noun) surgical removal of the palatine tonsils; commonly performed along with adenoidectomy | - |
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| tonsillitis | (noun) inflammation of the tonsils (especially the palatine tonsils) | - |
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| tornillo | (noun) shrub or small tree of southwestern United States and northwestern Mexico having spirally twisted pods | Synonyms: Prosopis pubescens, screw bean, screwbean, screwbean mesquite |
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| tortilla | (noun) thin unleavened pancake made from cornmeal or wheat flour | - |
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| tranquilliser | (noun) a drug used to reduce stress or tension without reducing mental clarity | Synonyms: antianxiety agent, ataractic, ataractic agent, ataractic drug, tranquilizer, tranquillizer |
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| tranquillity | (noun) a disposition free from stress or emotion | Synonyms: placidity, quiet, repose, serenity, tranquility |
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| (noun) a state of peace and quiet | Synonyms: quietness, quietude, tranquility |
| (noun) an untroubled state; free from disturbances | Synonyms: quiet, tranquility |
| tranquillizer | (noun) a drug used to reduce stress or tension without reducing mental clarity | Synonyms: antianxiety agent, ataractic, ataractic agent, ataractic drug, tranquilizer, tranquilliser |
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| treadmill | (noun) a job involving drudgery and confinement | Synonyms: salt mine |
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| (noun) a mill that is powered by men or animals walking on a circular belt or climbing steps | Synonyms: tread-wheel, treadwheel |
| (noun) an exercise device consisting of an endless belt on which a person can walk or jog without changing place | - |
| treillage | (noun) latticework used to support climbing plants | Synonyms: trellis |
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| trichotillomania | (noun) an irresistible urge to pull out your own hair | - |
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| trill | (noun) a note that alternates rapidly with another note a semitone above it | Synonyms: shake |
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| (noun) the articulation of a consonant (especially the consonant `r') with a rapid flutter of the tongue against the palate or uvula | - |
| trillion | (noun) the number that is represented as a one followed by 12 zeros | Synonyms: 1000000000000, one million million |
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| (noun) the number that is represented as a one followed by 18 zeros in the UK | Synonyms: one million million million |
| (noun) a very large indefinite number (usually hyperbole) | Synonyms: bazillion, billion, gazillion, jillion, million, zillion |
| trillionth | (noun) one part in a trillion equal parts | Synonyms: one-trillionth |
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| trillium | (noun) any liliaceous plant of the genus Trillium having a whorl of three leaves at the top of the stem with a single three-petaled flower | Synonyms: wake-robin, wood lily |
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| trompillo | (noun) weedy nightshade with silvery foliage and violet or blue or white flowers; roundish berry widely used to curdle milk; central United States to South America | Synonyms: prairie berry, purple nightshade, silver-leaved nettle, silver-leaved nightshade, silverleaf nightshade, Solanum elaeagnifolium, white horse nettle |
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| tuille | (noun) armor plate that protects the hip and thigh | - |
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| twill | (noun) a cloth with parallel diagonal lines or ribs | - |
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| (noun) a weave used to produce the effect of parallel diagonal ribs | Synonyms: twill weave |
| unskillfulness | (noun) a lack of cognitive skill | - |
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| unwillingness | (noun) the trait of being unwilling | Synonyms: involuntariness |
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| uphill | (noun) the upward slope of a hill | - |
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| vacillation | (noun) changing location by moving back and forth | Synonyms: swing, swinging |
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| (noun) indecision in speech or action | Synonyms: hesitation, wavering |
| vacillator | (noun) one who hesitates (usually out of fear) | Synonyms: hesitater, hesitator, waverer |
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| vanilla | (noun) a distinctive fragrant flavor characteristic of vanilla beans | - |
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| (noun) a flavoring prepared from vanilla beans macerated in alcohol (or imitating vanilla beans) | Synonyms: vanilla extract |
| (noun) any of numerous climbing plants of the genus Vanilla having fleshy leaves and clusters of large waxy highly fragrant white or green or topaz flowers | - |
| vanillin | (noun) a crystalline compound found in vanilla beans and some balsam resins; used in perfumes and flavorings | - |
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| vaudeville | (noun) a variety show with songs and comic acts etc. | Synonyms: music hall |
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| vaudevillian | (noun) a performer who works in vaudeville | - |
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| verticilliosis | (noun) wilt caused by fungi of the genus Verticillium | - |
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| verticillium | (noun) a fungus of the genus Verticillium | - |
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| villa | (noun) pretentious and luxurious country residence with extensive grounds | - |
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| (noun) country house in ancient Rome consisting of residential quarters and farm buildings around a courtyard | - |
| (noun) detached or semidetached suburban house | - |
| village | (noun) a community of people smaller than a town | Synonyms: settlement, small town |
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| (noun) a settlement smaller than a town | Synonyms: hamlet |
| villager | (noun) one who has lived in a village most of their life | - |
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| villain | (noun) a wicked or evil person; someone who does evil deliberately | Synonyms: scoundrel |
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| (noun) the principal bad character in a film or work of fiction | Synonyms: baddie |
| villainage | (noun) the legal status or condition of servitude of a villein or feudal serf | Synonyms: villeinage |
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| villainess | (noun) a woman villain | - |
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| villainousness | (noun) the quality of evil by virtue of villainous behavior | Synonyms: villainy |
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| villainy | (noun) a criminal or vicious act | - |
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| (noun) the quality of evil by virtue of villainous behavior | Synonyms: villainousness |
| villein | (noun) (Middle Ages) a person who is bound to the land and owned by the feudal lord | Synonyms: helot, serf |
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| villeinage | (noun) tenure by which a villein held land | - |
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| (noun) the legal status or condition of servitude of a villein or feudal serf | Synonyms: villainage |
| villoma | (noun) a benign epithelial tumor forming a rounded mass | Synonyms: papillary tumor, papillary tumour, papilloma |
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| villus | (noun) a minute hairlike projection on mucous membrane | - |
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| volaille | (noun) the flesh of a chicken used for food | Synonyms: chicken, poulet |
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| waybill | (noun) a receipt given by the carrier to the shipper acknowledging receipt of the goods being shipped and specifying the terms of delivery | Synonyms: bill of lading |
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| weedkiller | (noun) a chemical agent that destroys plants or inhibits their growth | Synonyms: herbicide, weed killer |
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| whippoorwill | (noun) American nocturnal goatsucker with grey-and-white plumage | Synonyms: Caprimulgus vociferus |
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| will | (noun) the capability of conscious choice and decision and intention | Synonyms: volition |
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| (noun) a fixed and persistent intent or purpose | - |
| (noun) a legal document declaring a person's wishes regarding the disposal of their property when they die | Synonyms: testament |
| willet | (noun) large North American shorebird of eastern and Gulf Coasts | Synonyms: Catoptrophorus semipalmatus |
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| willfulness | (noun) the trait of being prone to disobedience and lack of discipline | Synonyms: fractiousness, unruliness, wilfulness |
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| willies | (noun) feelings of uneasiness | - |
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| willing | (noun) the act of making a choice | Synonyms: volition |
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| willingness | (noun) cheerful compliance | - |
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| willow | (noun) a textile machine having a system of revolving spikes for opening and cleaning raw textile fibers | - |
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| (noun) any of numerous deciduous trees and shrubs of the genus Salix | Synonyms: willow tree |
| willowherb | (noun) a plant of the genus Epilobium having pink or yellow flowers and seeds with silky hairs | - |
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| willowware | (noun) chinaware decorated with a blue Chinese design on a white background depicting a willow tree and often a river | Synonyms: willow-pattern |
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| willpower | (noun) the trait of resolutely controlling your own behavior | Synonyms: possession, self-command, self-control, self-possession, self-will, will power |
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| windmill | (noun) generator that extracts usable energy from winds | Synonyms: aerogenerator, wind generator |
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| (noun) a mill that is powered by the wind | - |
| windowsill | (noun) the sill of a window; the horizontal member at the bottom of the window frame | - |
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| zill | (noun) one of a pair of small metallic cymbals worn on the thumb and middle finger; used in belly dancing in rhythm with the dance | - |
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| zillion | (noun) a very large indefinite number (usually hyperbole) | Synonyms: bazillion, billion, gazillion, jillion, million, trillion |
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